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The conductor attempts to cancel the field from its interior by creating an opposing field on its surface. Imagine a metal bus-bar oriented from left to right, say 3 feet long, 1 inch thick, 3 inches wide. The 3 inches is up and down. We generate a static field up and down of 10 volts per inch. The bus-bar will charge in the up and down direction to 30 volts, reverse polarity. The internal field will be zero. We are in a conductor. As long as there is field, current will flow, until the current causes an opposing field equal to the externally caused field. If you hollow out the bus-bar the inside will be field free. This is one way to make a Faraday cage or screen room. If the external field is AC, the opposing field will be AC. Current will flow on the surface in response to the AC. This same mechanism is responsible for skin effect, wherein current flow is restricted to a thin layer at the surface. This makes the resistance of the conductor appear much higher. At 60 hertz, this costs the electric companies of the world significant energy loss. At higher frequencies, skin effect gets much worse.
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What is capable of storing electrical energy in an electrostatic field?
condenser
Why 400kVA and above the transmission line have bundled conductor?
To reduce the electric field intensity at the surface of the conductor which can lead to corona discharge and insulation breakdown. By using bundled conductors, the electric field is distributed between the four (in the case of 400-kV lines) conductors, thus reducing the field intensity per conductor.
Is there a magnetic field around current carrying conductors?
yes.magnetic field present around the conductor.current and magnetic fields are inter related..with current we can produce magnetic field and vice versa
What 3 factors that affect the output of a generator?
1:The strenght of the main magnetic Field. Determined by the strenght of the field magnets in a permanent magnet machine, or by the number of turns of wire on the field coils and the current through the coils in a wound field machine.2: The number of armature conductors connected in series, which cut the main magnetic field. Determined by the number of turns on armature coils and weather the armature is lap or wave wound, which determines the number of armature conductors connected in series.3: The speed at which the armature conductors cut the main magnetic field. The faster the armature cuts the magnetic Field, the higher will be the value of the voltage generated in the machine
Is it true that shield wires conductors located above the phase conductors protect the phase conductors against lightning?
Yes, but they're not 'phase' conductors, they're 'line' conductors.
What is the magnetic behavior of super conductors?
a high magnetic field
Why it is possible to define an electrostatic potential in a region of space that contains an electrostatic field?
Because there is an electrostatic field in that region of space
What is capable of storing electrical energy in an electrostatic field?
condenser
How does electric field intensity form?
due electrostatic force
How will you shield a sensitive instrument from a strong electrostatic field?
By keeping it inside in a hollow conducting sphere. This process is known as electrostatic shielding.
What determines the direction of polarization of a radiated electromagnetic field?
The polarization of an electromagnetic field is defined as the direction of its E field (electrostatic).
What do you use in a vacuum to bend electronic beams?
Either an electrostatic field or a magnetic field. Each type is used in cathode ray tubes: generally, electrostatic in oscilloscopes, magnetic in television and computer CRTs.
Is water defected by a non uniform electrostatic field?
Yes, water can be deflected by a non-uniform electrostatic field. Water molecules are polar, meaning they have a positive charge on one end and a negative charge on the other. When a non-uniform electrostatic field is applied, the positive and negative ends of the water molecules will experience different forces, causing the water to be deflected.
Does a compacitor store energy in an electrostatic field?
Yes. That's exactly what a capacitordoes.
What is the principle of electrostatic shielding?
The method of protecting a region from the effect of electric field is called electrostatic shielding. The electric field inside the cavity of a conductor is zero. Therefore, any instrument or an appliance can be placed in the cavity of a conductor so that it may not be affected by the electric field.
What is the left hand rule for conductors?
The left hand rule for conductors says that your fingers will point in the direction of the resulting magnetic field. The magnetic field is produced by the electron flow.
Can electricity be produced from a stationary magnetic field?
Yes, by moving the conductors through the magnetic field.
